If a point is located exactly on the border of a geometry, the result
depends on the strategy. The default strategy (Winding
(coordinate system agnostic)) returns false in that case.

If a polygon has a reverse oriented (e.g. counterclockwise for a clockwise
typed polygon), the result also depends on the strategy. The default
strategy returns still true if a point is completely within the reversed
polygon. There is a specific strategy which returns false in this case.